Bio balls or Live rock for the sump?

[BIGgourami]

there's nothing eating the things in the sand when it's in the sump...
i would keep sand in both...
if the skimmer isn't a Hang On the Back type they usaully HAVE to go in a sump...

 

[rdefino]

So how does this sound. I have my sump with 3 chambers:
1st) drain water, heaters, skimmer
2nd) live sand 6" thick, the rest with live rock fully submerged
3rd) return

How does this sound?

thanks

 

[BIGgourami]

sounds good if you can keep the sand in place...

 

[rdefino]

Ok, I heard from someone that deep sands beds are no good. Also Bio balls are no good.

What do I do? What about 1.5" os live real sand for the main tank. with about 240lbs of live rock. then I fill the sump with Lr and use the skimmer also.

Would this be a good idea?